Dental tool.



PATENTED JAN. 14, 1908.

L. S. ROBINSON.

DENTAL TOOL.

APPLIGATION FILED JULY 1a, 1906.

WITNESSES:

nal sectional view of the same.- Figs. 3, 4

\ 3/32 0. D. (outside diameter).

UNITED STATES LEosoBINsoN, 0F ALAMED'A, CALIFORNIA.

DENTAL TOOL.

Specification of Letters Patent.

Patented Jan. 14, 1908'.

Application filed July 18. 1906. Serial No. 326.692.

To all whom it may concern: a

Be it known that I, LEO S. ROBINSON, 01th zen of the'United States, residin at Alameda,

in the county of Alameda andtate of California have invented new and useful Imrovements in Dental Tools, of which the ollowing is a specification. Y

My invention re1ates to-rotary abrading, cleaning and polishingtools used in the 1practice of dentistry, and pertains especia y to the combination by novel means-in a unified structure of a dental disk, or grinding .and polishing annulus, and a hollow mandrel.

My invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, m which Figure 1 is; an end view of a dental tool embodying my invention. Fig. 2 is a'longitudiand 5 are-. similar sectional views of modified construction to be hereinafter described.

In the preferred form of my invention, with articular reference to bristle brushes, and shown in Figs. 1 to 3 inclusive A re resents a tubular shank, stem or mandrel of ordinary metal tubing, of approseamed orseamless, so long as it is expansible and for dental purposes is usual y about priate size and length. i This tube may be 2 is a short sleeve fittin over one end of tube A, and having a suita le mtegral annular flange 3, made of suitable shape to form a seat for'one side of the brush.

5 is a washer correspond ing in shape to the flange or head 3 and adapted to support the opposite side of the brist e disk 4;.

6 is a common wire nail'ada ted to be passed through washer 5 and t rough the center of the bristles and .to be forced or driven into the tube A to expand the latter against the surrounding sleeve 2 and hold the parts fixedly together.

The main feature of this invention is the use'of a hollow expansible stem or mandrel having a bore of relatively smaller diameter than that of the nail, whereby the latter will act expansivel when driven home to hold the sleeve to t e mandrel, and to clamp the disk between the'p'arts 3 -5. These nails re resent the ordinary wire' or other may nai s w rose well known barbs, not shown,

0 crate-to bite into the tube and prevent t c nail from working loose.

- The brash-4 is preferably made by takinga bundle of bristles b and binding them about the middle as at b, The nail 6 having the washe'rfi in position, is then passed lengthwise through the center of this bundle, and the point of the nail is inserted into the end of the tube A. When the nail is driven into tube A to expand the latter, the parts 3' 5 act to spread the two ends'of the bundle umbrella'fashion, and to fold'them so that when the nail is driven up to the head, the complete brush 4 will be formed, all of the parts of the device being rigidly and permanently connected. i l

In Fi 4 I show a modificationof the inr vention m which the same principle of a hollow shank A and nail 6 is used, but the 011 3 is separate from thesleeve2. Thewas ers and cups may be of any shape or size accordto the description of brush desired.-

i ln Fig. 5 is shown, a further'modification wherein the washer is omitted and the head 5 of the nail 6" bears directly against the bristles. 1 I

In all cases the outer sleeve 22 &c.. acts as a reinforce to the end of the tubular mansame princi lev covers the construction of cup-shaped rushes as in Fig. 4. r In fact by dental disk or dental annulus,, I mean any shag: of rotary brush or grinder, polisher "or the l Y Having thus described my invention, what I claim and desire to secure by Letters Patent, is

1. Ina dental tool, the combination of a tubular ex ansive mandrel, a sleeve fitting the end of t e mandrel, a dental disk, a flange and washer between which the disk is held,

and a nail passed through the Washer and disk and forced into the tube to expand the latter against the sleeve and hold the disk in fixed position between said flange and washer.

2. -A rotary dental tool comprising a hollow stem, a flanged sleeve fitting an end of the stem, a nail driven into the end of the stem embraced by said sleeve to ex and the f I stem against the sleeve, and a denta annulu 3. A- brush comprising a hollow ex ansible stem, a sleeve to embrace an end of the stem, a nail 'oflarger diameter thanthe bore of the stem driven into ,,the end of the stem embraced by the sleeve, op osed co-acting members surrounding the na said members consisting of a flange on the sleeve and a washer carried'by the nail, and a brush com prising a bundle of fibers bound around their middle With said nail passed lengthwise through the bundle and driven into the stem to fold the bristles and spread them radially between said flange and Washer and unite the bristles, sleeve, Washer and stem in a rigid unitary structure.

svasaa 4. A rotar dental tool com rising a hollow stem, a s eeve fitting an en of said stem,

a flange at the end of said sleeve, a brush comprising a bundle of fiber'sbound around. their middle, a nail of larger diameter than the bore of said stem extending through the center of the bundle of fibers and into the end of theportions of the stem embraced by said sleeve, said nail being provided with means gor clamping the bundle of flbers against said ange. Y

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. I

' LEO S. ROBINSON. Witnesses:

S. H. Nounsn, O. H. HARVEY. 

